Magnetic layout punch



Patented Oct. 17, 1950 -UNITED STATES PATENT OFFICE 2,526,528 I'MAGNETIC LAYOUT PUNCH Charles R. Zickler, Charles R..Zickler, Jr., and-Warren 0.. Zickler, Yonkers, N. Y.

ApplicaticniDeceinber 31, 1948, Serial N0. 68,636

' 2 Claims.

This invention relates to a magnetic-layout punch.

It is an object of the present invention to provide a magnetic layoutpunch-adapted to be placed on a fiat surface having crossed lines forthe purpose of retaining a punch over the exact intersection of thelines and to retain the punch in such a manner that it is not easilymovable when the hammering action is effected upon the same, and whereinthe need for setting up work on a jig, to provide the desired accuracyin the locating of punch holes, is avoided.

Other objects of the present invention are to provide a magnetic layoutpunch which is of simple construction, inexpensive to manufacture, easyto operate, of compact and sturdy construction and emcient in operation.

For other objects and for a better undestanding of the invention,reference may be had to the following detailed description taken inconnection with the accompanying drawing, in which Fig. 1 is aperspective View of a magnetic .layout punch set up on a piece of sheetmaterial and with illustration made to a hammer which is used forstriking the punch.

Fig. 2 is a vertical sectional view of the magnetic layout punch asviewed on line 2-2 of Fig. 1.

Fig. 3 is a top plan view of the punch.

Referring now to the figures, l represents a flat sheet of material onwhich has been disposed, at different locations, crossed lines I l andI2 at the intersection of the same there is to be punched an opening orcenter mark for the insertion of a drill point.

My layout punch device comprises an external shell I3 having a topinwardly extending flange l4 and a bottom outwardly extending flange l5serving as a foot portion. On this foot portion are markings l6 andaligned notches l1. These markings and notches are disposed ninetydegrees apart and are adapted to be aligned with the respective crossedlines H and I2. Fitted within the external sleeve I3 is a bushing l8 ofnon-magnetic material containing a hollow permanent magnet I9. Withinthe magnet is an internal bushing 2| having an outwardly extending footportion 22 engaging with the bottom of the magnet and an outwardly benttop flange 2 3 resting on the flange I4 of the outer sleeve I3 wherebyto positively support the magnet within the outer sleeve l3. Theinternal bushing 2| is of non-magnetic material and receives a metalpunch 24 having a pointed operating end 25 and a top knurled handleportion 26 and a striking at locate a hole in the sheet material It]. Asthe punch is struck and with the magnetic layout device properly locatedon the crossed lines H and |2, a center punch mark exactly at thecrossing of the two lines is effected after which a center drill can beused to drill through the sheet material. The bottom ends of thebushings, magnet and outer casing are exactly flush with one another andsmooth so that good engagement is made with the flat sheet material. Themagnet will also hold the punch in place within the inner bushing 2| sothat it is unnecessary to hold the punch element 24 when striking thesame, providing the sheet material is magnetic. If work is beingperformed on non-magnetic material, the device will be held in place byhand while striking the punch element.

All parts of the punch are held together with a press fit. The innerbushing 2| can be omitted if desired, whereby to provide a lessexpensive construction. The punch 24 would, accordingly, ride directlythrough the permanent magnet H! which may have a smaller internaldiameter than that shown.

It will be further understood that our invention is not limited to theembodiment shown and described in our application, and that theprinciple of using a base of any shape, together with proper layoutaligning lines, points or incisions, to suit the particular kind oflayout that one may prefer, may also be embodied in our invention.

While various changes may be made in the detail construction, it shallbe understood that such changes shall be within the spirit and scope ofthe present invention as defined by the appended claims.

Having thus set forth and disclosed the nature of our invention, what isclaimed is:

1. A magnetic layout punch having an outer magnetic casing with a bottomfoot portion thereon, a permanent inner magnet of hollow cylindricalshape tightly fitted within a nonmagnetic bushing and the outer casing,an inner bushing having a radially extended bottom flange engaging withthe bottom end of the inner magnet, said outer casing having a radiallyinwardly extending flange on its upper end to provide a top face, saidinner bushing having a radially outwardly extending flange on its upperend extending outwardly over the top face of the radially inwardlyextending flange of the outer casing whereby to retain the inner magnetagainst outward and QQWnward displacement from the outer casing, and apunch element adjustable through the inner bushing and extendablethrough the lower end of the bushing.

2. A magnetic layout punch having an outer magnetic casing with a bottomfoot portion thereon, a permanent inner magnet of hollow cylindricalshape tightly fitted within a nonmagnetic bushing and the outer casing,an inner bushing having a radially extended bottom flange engaging withthe bottom end of the inner magnet, said outer casing having a radiallyinwardly extending flange on its upper end to provide a top face, saidinner bushing having a radially outwardly extending flange on its upperend extending outwardly over the top face of the radially inwardlyextending flange of the outer casing whereby to retain the inner magnetagainst outward and downward displacement from the outer casing, and apunch element adjustable through the inner bushing and extendaablethrough the lower end of the bushing, and

guide marks ninety degrees apart on the upper surface of said bottomfoot portion on the outer casing, adapted to be aligned with crossedlines on a work piece.

CHARLES R. ZICKLER. CHARLES R. ZICKLER, JR.

WARREN C. ZI'CKLER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

